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In a new paper, physicists argue that hypothetical particles called axions could explain why the universe isn’t empty.
A proposal for building wormhole-connected black holes offers a way to probe the paradoxes of quantum information.
A recent neutron star merger has defied astronomers’ expectations, leading them to question longstanding ideas about neutron stars and the supernovas that create them. “We have to go back to the drawing board.”
By watching for a special kind of flare, astronomers have identified the fingerprints of an Earth-size planet orbiting a distant star.